小程序端：

  wx.request({url: registerphone, //自己的地址data: {openid: openid,encryptedData: encryptedData, //手机加密数据iv: iv, // 加密ivsession_key: session_key,// 加密key},method: "post",header: {"content-type": "application/x-www-form-urlencoded",},success: (resp) => {console.log(resp);// 返回手机号},});

springboot后台：

pom.xml maven 依赖包：

        <dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-jdk15on</artifactId><version>1.70</version></dependency>

http 后台代码：

@PostMapping("/registerphone")public String registerphone(String openid, String encryptedData, String iv, String session_key){String retS = "";String appid = "wxc32bd5819d7a1cc5";try{JSONObject decryptObject = NativeUtils.decrypt(appid, encryptedData, session_key, iv);//logger.info(decryptObject.toJSONString());retS = decryptObject.getString("phoneNumber");} catch (Exception ex){}return retS;}//---------------------------------------------------------------------------------
// 解密接口/*** 解密数据* @return* @throws Exception*/public static JSONObject decrypt(String appId, String encryptedData, String sessionKey, String iv){try {byte[] resultByte = decrypt(Base64.decodeBase64(encryptedData),Base64.decodeBase64(sessionKey),Base64.decodeBase64(iv));if(null != resultByte && resultByte.length > 0){String result = new String(WxPKCS7Encoder.decode(resultByte));JSONObject jsonObject = JSONObject.parseObject(result);String decryptAppId = jsonObject.getJSONObject("watermark").getString("appid");if(!appId.equals(decryptAppId)){return null;}return jsonObject;}} catch (Exception e) {e.printStackTrace();}return null;}static {Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());}/*** AES解密** @param content*            密文* @return* @throws InvalidAlgorithmParameterException* @throws NoSuchProviderException*/public static byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) throws InvalidAlgorithmParameterException {try {Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");Key sKeySpec = new SecretKeySpec(keyByte, "AES");cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte));// 初始化byte[] result = cipher.doFinal(content);return result;} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();} catch (InvalidKeyException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();} catch (NoSuchProviderException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}// 生成ivpublic static AlgorithmParameters generateIV(byte[] iv) throws Exception {AlgorithmParameters params = AlgorithmParameters.getInstance("AES");params.init(new IvParameterSpec(iv));return params;}

在网上找了好久，东拼洗凑居然能用，希望对写小程序的朋友有帮助。